13586005509

Committed 28 Feb 2025 10:14AM UTC coverage: 68.629% (+9.9%) from 58.77%

Build # 13586005509

Build Type

Pull #9521

github

Committed by

web-flow

Commit Message

Merge 37d3a70a5 into 8532955b3

Pull Request Pull Request #9521: unit: remove GOACC, use Go 1.20 native coverage functionality

Run Details

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60.24

/channeldb/migration21/legacy/legacy_decoding.go

package legacy

import (
        "bytes"
        "encoding/binary"
        "errors"
        "io"

        lnwire "github.com/lightningnetwork/lnd/channeldb/migration/lnwire21"
        "github.com/lightningnetwork/lnd/channeldb/migration21/common"
        "github.com/lightningnetwork/lnd/kvdb"
)

func deserializeHtlcs(r io.Reader) ([]common.HTLC, error) {
        var numHtlcs uint16
        if err := ReadElement(r, &numHtlcs); err != nil {
                return nil, err
        }

        var htlcs []common.HTLC
        if numHtlcs == 0 {
                return htlcs, nil
        }

        htlcs = make([]common.HTLC, numHtlcs)
        for i := uint16(0); i < numHtlcs; i++ {
                if err := ReadElements(r,
                        &htlcs[i].Signature, &htlcs[i].RHash, &htlcs[i].Amt,
                        &htlcs[i].RefundTimeout, &htlcs[i].OutputIndex,
                        &htlcs[i].Incoming, &htlcs[i].OnionBlob,
                        &htlcs[i].HtlcIndex, &htlcs[i].LogIndex,
                ); err != nil {
                        return htlcs, err
                }
        }

        return htlcs, nil
}

func DeserializeLogUpdates(r io.Reader) ([]common.LogUpdate, error) {
        var numUpdates uint16
        if err := binary.Read(r, byteOrder, &numUpdates); err != nil {
                return nil, err
        }

        logUpdates := make([]common.LogUpdate, numUpdates)
        for i := 0; i < int(numUpdates); i++ {
                err := ReadElements(r,
                        &logUpdates[i].LogIndex, &logUpdates[i].UpdateMsg,
                )
                if err != nil {
                        return nil, err
                }
        }

        return logUpdates, nil
}

func deserializeChanCommit(r io.Reader) (common.ChannelCommitment, error) {
        var c common.ChannelCommitment

        err := ReadElements(r,
                &c.CommitHeight, &c.LocalLogIndex, &c.LocalHtlcIndex, &c.RemoteLogIndex,
                &c.RemoteHtlcIndex, &c.LocalBalance, &c.RemoteBalance,
                &c.CommitFee, &c.FeePerKw, &c.CommitTx, &c.CommitSig,
        )
        if err != nil {
                return c, err
        }

        c.Htlcs, err = deserializeHtlcs(r)
        if err != nil {
                return c, err
        }

        return c, nil
}

func DeserializeCommitDiff(r io.Reader) (*common.CommitDiff, error) {
        var (
                d   common.CommitDiff
                err error
        )

        d.Commitment, err = deserializeChanCommit(r)
        if err != nil {
                return nil, err
        }

        d.CommitSig = &lnwire.CommitSig{}
        if err := d.CommitSig.Decode(r, 0); err != nil {
                return nil, err
        }

        d.LogUpdates, err = DeserializeLogUpdates(r)
        if err != nil {
                return nil, err
        }

        var numOpenRefs uint16
        if err := binary.Read(r, byteOrder, &numOpenRefs); err != nil {
                return nil, err
        }

        d.OpenedCircuitKeys = make([]common.CircuitKey, numOpenRefs)
        for i := 0; i < int(numOpenRefs); i++ {
                err := ReadElements(r,
                        &d.OpenedCircuitKeys[i].ChanID,
                        &d.OpenedCircuitKeys[i].HtlcID)
                if err != nil {
                        return nil, err
                }
        }

        var numClosedRefs uint16
        if err := binary.Read(r, byteOrder, &numClosedRefs); err != nil {
                return nil, err
        }

        d.ClosedCircuitKeys = make([]common.CircuitKey, numClosedRefs)
        for i := 0; i < int(numClosedRefs); i++ {
                err := ReadElements(r,
                        &d.ClosedCircuitKeys[i].ChanID,
                        &d.ClosedCircuitKeys[i].HtlcID)
                if err != nil {
                        return nil, err
                }
        }

        return &d, nil
}

func serializeHtlcs(b io.Writer, htlcs ...common.HTLC) error {
        numHtlcs := uint16(len(htlcs))
        if err := WriteElement(b, numHtlcs); err != nil {
                return err
        }

        for _, htlc := range htlcs {
                if err := WriteElements(b,
                        htlc.Signature, htlc.RHash, htlc.Amt, htlc.RefundTimeout,
                        htlc.OutputIndex, htlc.Incoming, htlc.OnionBlob,
                        htlc.HtlcIndex, htlc.LogIndex,
                ); err != nil {
                        return err
                }
        }

        return nil
}

func serializeChanCommit(w io.Writer, c *common.ChannelCommitment) error {
        if err := WriteElements(w,
                c.CommitHeight, c.LocalLogIndex, c.LocalHtlcIndex,
                c.RemoteLogIndex, c.RemoteHtlcIndex, c.LocalBalance,
                c.RemoteBalance, c.CommitFee, c.FeePerKw, c.CommitTx,
                c.CommitSig,
        ); err != nil {
                return err
        }

        return serializeHtlcs(w, c.Htlcs...)
}

func SerializeLogUpdates(w io.Writer, logUpdates []common.LogUpdate) error {
        numUpdates := uint16(len(logUpdates))
        if err := binary.Write(w, byteOrder, numUpdates); err != nil {
                return err
        }

        for _, diff := range logUpdates {
                err := WriteElements(w, diff.LogIndex, diff.UpdateMsg)
                if err != nil {
                        return err
                }
        }

        return nil
}

func SerializeCommitDiff(w io.Writer, diff *common.CommitDiff) error { // nolint: dupl
        if err := serializeChanCommit(w, &diff.Commitment); err != nil {
                return err
        }

        if err := diff.CommitSig.Encode(w, 0); err != nil {
                return err
        }

        if err := SerializeLogUpdates(w, diff.LogUpdates); err != nil {
                return err
        }

        numOpenRefs := uint16(len(diff.OpenedCircuitKeys))
        if err := binary.Write(w, byteOrder, numOpenRefs); err != nil {
                return err
        }

        for _, openRef := range diff.OpenedCircuitKeys {
                err := WriteElements(w, openRef.ChanID, openRef.HtlcID)
                if err != nil {
                        return err
                }
        }

        numClosedRefs := uint16(len(diff.ClosedCircuitKeys))
        if err := binary.Write(w, byteOrder, numClosedRefs); err != nil {
                return err
        }

        for _, closedRef := range diff.ClosedCircuitKeys {
                err := WriteElements(w, closedRef.ChanID, closedRef.HtlcID)
                if err != nil {
                        return err
                }
        }

        return nil
}

func DeserializeNetworkResult(r io.Reader) (*common.NetworkResult, error) {
        var (
                err error
        )

        n := &common.NetworkResult{}

        n.Msg, err = lnwire.ReadMessage(r, 0)
        if err != nil {
                return nil, err
        }

        if err := ReadElements(r,
                &n.Unencrypted, &n.IsResolution,
        ); err != nil {
                return nil, err
        }

        return n, nil
}

func SerializeNetworkResult(w io.Writer, n *common.NetworkResult) error {
        if _, err := lnwire.WriteMessage(w, n.Msg, 0); err != nil {
                return err
        }

        return WriteElements(w, n.Unencrypted, n.IsResolution)
}

func readChanConfig(b io.Reader, c *common.ChannelConfig) error { // nolint: dupl
        return ReadElements(b,
                &c.DustLimit, &c.MaxPendingAmount, &c.ChanReserve,
                &c.MinHTLC, &c.MaxAcceptedHtlcs, &c.CsvDelay,
                &c.MultiSigKey, &c.RevocationBasePoint,
                &c.PaymentBasePoint, &c.DelayBasePoint,
                &c.HtlcBasePoint,
        )
}

func DeserializeCloseChannelSummary(
        r io.Reader) (*common.ChannelCloseSummary, error) { // nolint: dupl

        c := &common.ChannelCloseSummary{}

        err := ReadElements(r,
                &c.ChanPoint, &c.ShortChanID, &c.ChainHash, &c.ClosingTXID,
                &c.CloseHeight, &c.RemotePub, &c.Capacity, &c.SettledBalance,
                &c.TimeLockedBalance, &c.CloseType, &c.IsPending,
        )
        if err != nil {
                return nil, err
        }

        // We'll now check to see if the channel close summary was encoded with
        // any of the additional optional fields.
        var hasNewFields bool
        err = ReadElements(r, &hasNewFields)
        if err != nil {
                return nil, err
        }

        // If fields are not present, we can return.
        if !hasNewFields {
                return c, nil
        }

        // Otherwise read the new fields.
        if err := ReadElements(r, &c.RemoteCurrentRevocation); err != nil {
                return nil, err
        }

        if err := readChanConfig(r, &c.LocalChanConfig); err != nil {
                return nil, err
        }

        // Finally, we'll attempt to read the next unrevoked commitment point
        // for the remote party. If we closed the channel before receiving a
        // funding locked message then this might not be present. A boolean
        // indicating whether the field is present will come first.
        var hasRemoteNextRevocation bool
        err = ReadElements(r, &hasRemoteNextRevocation)
        if err != nil {
                return nil, err
        }

        // If this field was written, read it.
        if hasRemoteNextRevocation {
                err = ReadElements(r, &c.RemoteNextRevocation)
                if err != nil {
                        return nil, err
                }
        }

        // Check if we have a channel sync message to read.
        var hasChanSyncMsg bool
        err = ReadElements(r, &hasChanSyncMsg)
        if err == io.EOF {
                return c, nil
        } else if err != nil {
                return nil, err
        }

        // If a chan sync message is present, read it.
        if hasChanSyncMsg {
                // We must pass in reference to a lnwire.Message for the codec
                // to support it.
                msg, err := lnwire.ReadMessage(r, 0)
                if err != nil {
                        return nil, err
                }

                chanSync, ok := msg.(*lnwire.ChannelReestablish)
                if !ok {
                        return nil, errors.New("unable cast db Message to " +
                                "ChannelReestablish")
                }
                c.LastChanSyncMsg = chanSync
        }

        return c, nil
}

func writeChanConfig(b io.Writer, c *common.ChannelConfig) error { // nolint: dupl
        return WriteElements(b,
                c.DustLimit, c.MaxPendingAmount, c.ChanReserve, c.MinHTLC,
                c.MaxAcceptedHtlcs, c.CsvDelay, c.MultiSigKey,
                c.RevocationBasePoint, c.PaymentBasePoint, c.DelayBasePoint,
                c.HtlcBasePoint,
        )
}

func SerializeChannelCloseSummary(w io.Writer, cs *common.ChannelCloseSummary) error {
        err := WriteElements(w,
                cs.ChanPoint, cs.ShortChanID, cs.ChainHash, cs.ClosingTXID,
                cs.CloseHeight, cs.RemotePub, cs.Capacity, cs.SettledBalance,
                cs.TimeLockedBalance, cs.CloseType, cs.IsPending,
        )
        if err != nil {
                return err
        }

        // If this is a close channel summary created before the addition of
        // the new fields, then we can exit here.
        if cs.RemoteCurrentRevocation == nil {
                return WriteElements(w, false)
        }

        // If fields are present, write boolean to indicate this, and continue.
        if err := WriteElements(w, true); err != nil {
                return err
        }

        if err := WriteElements(w, cs.RemoteCurrentRevocation); err != nil {
                return err
        }

        if err := writeChanConfig(w, &cs.LocalChanConfig); err != nil {
                return err
        }

        // The RemoteNextRevocation field is optional, as it's possible for a
        // channel to be closed before we learn of the next unrevoked
        // revocation point for the remote party. Write a boolean indicating
        // whether this field is present or not.
        if err := WriteElements(w, cs.RemoteNextRevocation != nil); err != nil {
                return err
        }

        // Write the field, if present.
        if cs.RemoteNextRevocation != nil {
                if err = WriteElements(w, cs.RemoteNextRevocation); err != nil {
                        return err
                }
        }

        // Write whether the channel sync message is present.
        if err := WriteElements(w, cs.LastChanSyncMsg != nil); err != nil {
                return err
        }

        // Write the channel sync message, if present.
        if cs.LastChanSyncMsg != nil {
                _, err = lnwire.WriteMessage(w, cs.LastChanSyncMsg, 0)
                if err != nil {
                        return err
                }
        }

        return nil
}

// ErrCorruptedFwdPkg signals that the on-disk structure of the forwarding
// package has potentially been mangled.
var ErrCorruptedFwdPkg = errors.New("fwding package db has been corrupted")

var (
        // fwdPackagesKey is the root-level bucket that all forwarding packages
        // are written. This bucket is further subdivided based on the short
        // channel ID of each channel.
        fwdPackagesKey = []byte("fwd-packages")

        // addBucketKey is the bucket to which all Add log updates are written.
        addBucketKey = []byte("add-updates")

        // failSettleBucketKey is the bucket to which all Settle/Fail log
        // updates are written.
        failSettleBucketKey = []byte("fail-settle-updates")

        // fwdFilterKey is a key used to write the set of Adds that passed
        // validation and are to be forwarded to the switch.
        // NOTE: The presence of this key within a forwarding package indicates
        // that the package has reached FwdStateProcessed.
        fwdFilterKey = []byte("fwd-filter-key")

        // ackFilterKey is a key used to access the PkgFilter indicating which
        // Adds have received a Settle/Fail. This response may come from a
        // number of sources, including: exitHop settle/fails, switch failures,
        // chain arbiter interjections, as well as settle/fails from the
        // next hop in the route.
        ackFilterKey = []byte("ack-filter-key")

        // settleFailFilterKey is a key used to access the PkgFilter indicating
        // which Settles/Fails in have been received and processed by the link
        // that originally received the Add.
        settleFailFilterKey = []byte("settle-fail-filter-key")
)

func makeLogKey(updateNum uint64) [8]byte {
        var key [8]byte
        byteOrder.PutUint64(key[:], updateNum)
        return key
}

// uint16Key writes the provided 16-bit unsigned integer to a 2-byte slice.
func uint16Key(i uint16) []byte {
        key := make([]byte, 2)
        byteOrder.PutUint16(key, i)
        return key
}

// ChannelPackager is used by a channel to manage the lifecycle of its forwarding
// packages. The packager is tied to a particular source channel ID, allowing it
// to create and edit its own packages. Each packager also has the ability to
// remove fail/settle htlcs that correspond to an add contained in one of
// source's packages.
type ChannelPackager struct {
        source lnwire.ShortChannelID
}

// NewChannelPackager creates a new packager for a single channel.
func NewChannelPackager(source lnwire.ShortChannelID) *ChannelPackager {
        return &ChannelPackager{
                source: source,
        }
}

// AddFwdPkg writes a newly locked in forwarding package to disk.
func (*ChannelPackager) AddFwdPkg(tx kvdb.RwTx, fwdPkg *common.FwdPkg) error { // nolint: dupl
        fwdPkgBkt, err := tx.CreateTopLevelBucket(fwdPackagesKey)
        if err != nil {
                return err
        }

        source := makeLogKey(fwdPkg.Source.ToUint64())
        sourceBkt, err := fwdPkgBkt.CreateBucketIfNotExists(source[:])
        if err != nil {
                return err
        }

        heightKey := makeLogKey(fwdPkg.Height)
        heightBkt, err := sourceBkt.CreateBucketIfNotExists(heightKey[:])
        if err != nil {
                return err
        }

        // Write ADD updates we received at this commit height.
        addBkt, err := heightBkt.CreateBucketIfNotExists(addBucketKey)
        if err != nil {
                return err
        }

        // Write SETTLE/FAIL updates we received at this commit height.
        failSettleBkt, err := heightBkt.CreateBucketIfNotExists(failSettleBucketKey)
        if err != nil {
                return err
        }

        for i := range fwdPkg.Adds {
                err = putLogUpdate(addBkt, uint16(i), &fwdPkg.Adds[i])
                if err != nil {
                        return err
                }
        }

        // Persist the initialized pkg filter, which will be used to determine
        // when we can remove this forwarding package from disk.
        var ackFilterBuf bytes.Buffer
        if err := fwdPkg.AckFilter.Encode(&ackFilterBuf); err != nil {
                return err
        }

        if err := heightBkt.Put(ackFilterKey, ackFilterBuf.Bytes()); err != nil {
                return err
        }

        for i := range fwdPkg.SettleFails {
                err = putLogUpdate(failSettleBkt, uint16(i), &fwdPkg.SettleFails[i])
                if err != nil {
                        return err
                }
        }

        var settleFailFilterBuf bytes.Buffer
        err = fwdPkg.SettleFailFilter.Encode(&settleFailFilterBuf)
        if err != nil {
                return err
        }

        return heightBkt.Put(settleFailFilterKey, settleFailFilterBuf.Bytes())
}

// putLogUpdate writes an htlc to the provided `bkt`, using `index` as the key.
func putLogUpdate(bkt kvdb.RwBucket, idx uint16, htlc *common.LogUpdate) error {
        var b bytes.Buffer
        if err := serializeLogUpdate(&b, htlc); err != nil {
                return err
        }

        return bkt.Put(uint16Key(idx), b.Bytes())
}

// LoadFwdPkgs scans the forwarding log for any packages that haven't been
// processed, and returns their deserialized log updates in a map indexed by the
// remote commitment height at which the updates were locked in.
func (p *ChannelPackager) LoadFwdPkgs(tx kvdb.RTx) ([]*common.FwdPkg, error) {
        return loadChannelFwdPkgs(tx, p.source)
}

// loadChannelFwdPkgs loads all forwarding packages owned by `source`.
func loadChannelFwdPkgs(tx kvdb.RTx, source lnwire.ShortChannelID) ([]*common.FwdPkg, error) { // nolint: dupl
        fwdPkgBkt := tx.ReadBucket(fwdPackagesKey)
        if fwdPkgBkt == nil {
                return nil, nil
        }

        sourceKey := makeLogKey(source.ToUint64())
        sourceBkt := fwdPkgBkt.NestedReadBucket(sourceKey[:])
        if sourceBkt == nil {
                return nil, nil
        }

        var heights []uint64
        if err := sourceBkt.ForEach(func(k, _ []byte) error {
                if len(k) != 8 {
                        return ErrCorruptedFwdPkg
                }

                heights = append(heights, byteOrder.Uint64(k))

                return nil
        }); err != nil {
                return nil, err
        }

        // Load the forwarding package for each retrieved height.
        fwdPkgs := make([]*common.FwdPkg, 0, len(heights))
        for _, height := range heights {
                fwdPkg, err := loadFwdPkg(fwdPkgBkt, source, height)
                if err != nil {
                        return nil, err
                }

                fwdPkgs = append(fwdPkgs, fwdPkg)
        }

        return fwdPkgs, nil
}

// loadFwdPkg reads the packager's fwd pkg at a given height, and determines the
// appropriate FwdState.
func loadFwdPkg(fwdPkgBkt kvdb.RBucket, source lnwire.ShortChannelID,
        height uint64) (*common.FwdPkg, error) {

        sourceKey := makeLogKey(source.ToUint64())
        sourceBkt := fwdPkgBkt.NestedReadBucket(sourceKey[:])
        if sourceBkt == nil {
                return nil, ErrCorruptedFwdPkg
        }

        heightKey := makeLogKey(height)
        heightBkt := sourceBkt.NestedReadBucket(heightKey[:])
        if heightBkt == nil {
                return nil, ErrCorruptedFwdPkg
        }

        // Load ADDs from disk.
        addBkt := heightBkt.NestedReadBucket(addBucketKey)
        if addBkt == nil {
                return nil, ErrCorruptedFwdPkg
        }

        adds, err := loadHtlcs(addBkt)
        if err != nil {
                return nil, err
        }

        // Load ack filter from disk.
        ackFilterBytes := heightBkt.Get(ackFilterKey)
        if ackFilterBytes == nil {
                return nil, ErrCorruptedFwdPkg
        }
        ackFilterReader := bytes.NewReader(ackFilterBytes)

        ackFilter := &common.PkgFilter{}
        if err := ackFilter.Decode(ackFilterReader); err != nil {
                return nil, err
        }

        // Load SETTLE/FAILs from disk.
        failSettleBkt := heightBkt.NestedReadBucket(failSettleBucketKey)
        if failSettleBkt == nil {
                return nil, ErrCorruptedFwdPkg
        }

        failSettles, err := loadHtlcs(failSettleBkt)
        if err != nil {
                return nil, err
        }

        // Load settle fail filter from disk.
        settleFailFilterBytes := heightBkt.Get(settleFailFilterKey)
        if settleFailFilterBytes == nil {
                return nil, ErrCorruptedFwdPkg
        }
        settleFailFilterReader := bytes.NewReader(settleFailFilterBytes)

        settleFailFilter := &common.PkgFilter{}
        if err := settleFailFilter.Decode(settleFailFilterReader); err != nil {
                return nil, err
        }

        // Initialize the fwding package, which always starts in the
        // FwdStateLockedIn. We can determine what state the package was left in
        // by examining constraints on the information loaded from disk.
        fwdPkg := &common.FwdPkg{
                Source:           source,
                State:            common.FwdStateLockedIn,
                Height:           height,
                Adds:             adds,
                AckFilter:        ackFilter,
                SettleFails:      failSettles,
                SettleFailFilter: settleFailFilter,
        }

        // Check to see if we have written the set exported filter adds to
        // disk. If we haven't, processing of this package was never started, or
        // failed during the last attempt.
        fwdFilterBytes := heightBkt.Get(fwdFilterKey)
        if fwdFilterBytes == nil {
                nAdds := uint16(len(adds))
                fwdPkg.FwdFilter = common.NewPkgFilter(nAdds)
                return fwdPkg, nil
        }

        fwdFilterReader := bytes.NewReader(fwdFilterBytes)
        fwdPkg.FwdFilter = &common.PkgFilter{}
        if err := fwdPkg.FwdFilter.Decode(fwdFilterReader); err != nil {
                return nil, err
        }

        // Otherwise, a complete round of processing was completed, and we
        // advance the package to FwdStateProcessed.
        fwdPkg.State = common.FwdStateProcessed

        // If every add, settle, and fail has been fully acknowledged, we can
        // safely set the package's state to FwdStateCompleted, signalling that
        // it can be garbage collected.
        if fwdPkg.AckFilter.IsFull() && fwdPkg.SettleFailFilter.IsFull() {
                fwdPkg.State = common.FwdStateCompleted
        }

        return fwdPkg, nil
}

// loadHtlcs retrieves all serialized htlcs in a bucket, returning
// them in order of the indexes they were written under.
func loadHtlcs(bkt kvdb.RBucket) ([]common.LogUpdate, error) {
        var htlcs []common.LogUpdate
        if err := bkt.ForEach(func(_, v []byte) error {
                htlc, err := deserializeLogUpdate(bytes.NewReader(v))
                if err != nil {
                        return err
                }

                htlcs = append(htlcs, *htlc)

                return nil
        }); err != nil {
                return nil, err
        }

        return htlcs, nil
}

// serializeLogUpdate writes a log update to the provided io.Writer.
func serializeLogUpdate(w io.Writer, l *common.LogUpdate) error {
        return WriteElements(w, l.LogIndex, l.UpdateMsg)
}

// deserializeLogUpdate reads a log update from the provided io.Reader.
func deserializeLogUpdate(r io.Reader) (*common.LogUpdate, error) {
        l := &common.LogUpdate{}
        if err := ReadElements(r, &l.LogIndex, &l.UpdateMsg); err != nil {
                return nil, err
        }

        return l, nil
}

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